[NTLUG:Discuss] C pointer questions

[Paul Ingendorf]

>From what I read in the question you are looking for the strings functions

#include <string.h>

char *a = " a test.", *b = "This is";
b = strcat( b, a );
printf(b);

Should print:
This is a test

Hope that helps you.

Quoting Fred James <fredjame at concentric.net>:

> What I am trying to do is append one body of text to another (B to A),
> 
> both of which are referenced by pointers, and then copy A to B so the 
> result would be the same as if I had inserted A at the top of B (because
> 
> I am going to use B in my final fwrite()).  Any suggestions would be 
> most apprecated.  Full code upon request.
> 
> Here is a snippet of the orginal C code, which works by the way:
> [original code begins]
>      sprintf(mailCmd,
>              "/usr/sbin/mailx -s '%s' %s",
>              pSubject,
>              pRecipientList);
> 
>      errno = 0;
> 
>      if ( (pMailPipe = popen (mailCmd, "w")) != NULL )
>      {
>          if ( fwrite (pMessage, strlen (pMessage), 1, pMailPipe)
>               == strlen (pMessage) )
>          {
>              errorStatus = pclose(pMailPipe);
>          }
>          else
>          {
>              errorStatus = errno;
>              (void) pclose (pMailPipe);
>          }
>      }
>      else
>      {
>          errorStatus = errno;
>      }
> 
>      return errorStatus;
> [original code ends]
> 
> Here is the same snippet plus some stuff I am trying to add (at the 
> top), without too much success so far:
> [modified code begins]
>      sprintf(AppendCmd, "echo \"~|uuencode '%s'\" > '%s'", pAttachment,
> 
> pAttachment);
> 	system(AppendCmd);
>      sprintf(AppendCmd, "cat '%s' >> '%s'", pMessage, pAttachment);
> 	system(AppendCmd);
> 	pMessage = pAttachment;
> 
>      sprintf(mailCmd,
>              "/usr/sbin/mailx -s '%s' %s",
>              pSubject,
>              pRecipientList);
> 
>      errno = 0;
> 
>      if ( (pMailPipe = popen (mailCmd, "w")) != NULL )
>      {
>          if ( fwrite (pMessage, strlen (pMessage), 1, pMailPipe)
>               == strlen (pMessage) )
>          {
>              errorStatus = pclose(pMailPipe);
>          }
>          else
>          {
>              errorStatus = errno;
>              (void) pclose (pMailPipe);
>          }
>      }
>      else
>      {
>          errorStatus = errno;
>      }
> 
>      return errorStatus;
> }
> [modified code ends]
> 
> 
> -- 
> small is beautiful
> 
> 
> _______________________________________________
> https://ntlug.org/mailman/listinfo/discuss
> 



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